I think that the problem is that $gray-600 is not declared, you should create a new variable and change it or you can copy the grey scale from the boostrap _variables.scss file and paste the variables before $theme-colors declaration
Hope it works!
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I think that the problem is that
$gray-600is not declared, you should create a new variable and change it or you can copy the grey scale from the boostrap _variables.scss file and paste the variables before$theme-colorsdeclarationHope it works!